Birmingham, England, a sunny day in the city park. Children play, adults stroll - and a man lies dead in a pool of blood. His shocked fiance screams for help.

The assailant strolls away into the trees...

Chief Inspector David Jones and his protege, Sergeant Phil Cryer, are called to investigate the most difficult of crimes - an apparently motiveless, random attack. Hampered by a lack of resources, Jones and Cryer have to act quickly to or risk a murder spree...